连栋塑料温室自然通风流场的稳态模拟——防虫网对温室内流场的影响  

Static simulation of airflow distribution inside multi-span plastic greenhouse:influence of insect-proof screens on airflow inside greenhouse

作　　者：沈明卫[1] 郝飞麟 

机构地区：[1]浙江大学农业生物环境工程研究所,浙江杭州310029 [2]中国空分设备公司环境与公用工程部,浙江杭州310004

出　　处：《浙江大学学报（工学版）》2006年第11期1852-1857,共6页Journal of Zhejiang University：Engineering Science

基　　金：浙江省自然科学基金资助项目(M303436)

摘　　要：以Navier-Stokes方程为基础,运用计算流体动力学软件CFX对华东地区典型结构的连栋塑料温室内的自然通风流场进行了三维稳态模拟,分析了防虫网对温室内自然通风流场的影响.模拟温室采用1∶10的缩小模型,外界风向取平行于温室屋脊方向.模拟结果表明,不论温室是否配置防虫网,温室内的气流场分布均不对称.在无防虫网条件下,风压通风占主导作用,温室下部侧窗为主要通风口,气流强度在顶窗开口对侧区域相对剧烈,气流运动不均匀.在温室设置防虫网后,温室内气流强度有所减弱,热压通风作用增大,此时顶窗成为温室通风的重要部位;相对无防虫网的情况,温室内气流运动虽然在顶窗开口对侧中下部、顶窗开口侧上部有局部加强,但整体运动较为均衡.Based on Navier-Stokes equation and with CFX software as analyzing means, 3D static simulation of natural ventilation airflow in multi-span plastic greenhouse was conducted to analyze the influence of insect-proof screens on airflow trait. The simulating greenhouse was scaled to 1 ： 10 with the outside wind direction being parallel to the greenhouse ridge. The results show that the airflow inside the greenhouse is asymmetrical whether insect-proof is installed or not. On condition of no insect-proof set, wind pressure leading to ventilation plays a dominant role, where the sidewall windows contribute major ventilative function. Airflow in the side opposite the transom window is comparatively acute and the airflow pattern is not orderly. On condition of insect-proof fixed, the airflow intensity becomes weaker to a certain extent, the ＂buoyancy effect＂ accounts for much airflow movement, with the transom window playing an important part in ventilation. The airflow gets stronger in the infra-midst area of the transom window＇s opposite side and the upper side of transom window, while the overall airflow movement inside the greenhouse is more proportionate in comparison with that of no insect-proof status.

关 键 词：温室 通风气流场模拟 防虫网 

分 类 号：S625.5[农业科学—园艺学] TP391.9[自动化与计算机技术—计算机应用技术]